Lyle and Stephanie Kercher, the siblings of murdered British student Meredith Kercher, issue a statement on Friday after a Florence court's decision on Thursday to uphold both Amanda Knox and Raffaele Sollecito's guilty verdicts. Kercher, 21, was found stabbed to death in Perugia in 2007. Knox remains at her home in the US and will not go to prison if attempts to extradite her fail